12564659 has 4 divisors (see below), whose sum is σ = 12576480. Its totient is φ = 12552840.

The previous prime is 12564637. The next prime is 12564667. The reversal of 12564659 is 95646521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95646521 = 103 ⋅928607.

It is a cyclic number.

It is not a de Polignac number, because 12564659 - 2¹² = 12560563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12564679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4139 + ... + 6500.

It is an arithmetic number, because the mean of its divisors is an integer number (3144120).

Almost surely, 2^12564659 is an apocalyptic number.

12564659 is a deficient number, since it is larger than the sum of its proper divisors (11821).

12564659 is a wasteful number, since it uses less digits than its factorization.

12564659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11820.

The product of its digits is 64800, while the sum is 38.

The square root of 12564659 is about 3544.6662748417. Note that the first 3 decimals coincide. The cubic root of 12564659 is about 232.4789143401.

The spelling of 12564659 in words is "twelve million, five hundred sixty-four thousand, six hundred fifty-nine".